Lobular elastic tube alignment and retention system for providing precise alignment of components

- General Motors

An elastically averaged alignment system has a first component having a first alignment member and an elastically deformable alignment element, and a second component having a second alignment member and an alignment aperture. The elastically deformable alignment element is configured and disposed to interferingly, deformably and matingly engage the alignment aperture. The elastically deformable alignment element includes a lobular hollow tube having four lobes, with a slotted retention feature on each of two opposing lobes that extend from an outer surface of the hollow tube radially inward toward a central axis of the hollow tube. Portions of the elastically deformable alignment element when inserted into the alignment aperture elastically deform to an elastically averaged final configuration that aligns the first alignment member with the second alignment member in at least two planar orthogonal directions. Each of the slotted retention features engages with an edge of the alignment aperture.

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Description
FIELD OF THE INVENTION

The subject invention relates to the art of alignment systems, more particularly to an elastically averaged alignment system, and even more particularly to an elastically averaged alignment system providing two-way or four-way alignment, or alignment and retention, of mating components on which the alignment system is incorporated.

BACKGROUND

Currently, components, particularly vehicular components such as those found in automotive vehicles, which are to be mated together in a manufacturing process are mutually located with respect to each other by alignment features that are oversized and/or undersized to provide spacing to freely move the components relative to one another to align them without creating an interference therebetween that would hinder the manufacturing process. One example includes two-way and/or four-way male alignment features, typically upstanding bosses, which are received into corresponding female alignment features, typically apertures in the form of holes or slots. There is a clearance between the male alignment features and their respective female alignment features which is predetermined to match anticipated size and positional variation tolerances of the male and female alignment features as a result of manufacturing (or fabrication) variances. As a result, significant positional variation can occur between the mated first and second components having the aforementioned alignment features, which may contribute to the presence of undesirably large variation in their alignment, particularly with regard to the gaps and spacing between them. In the case where these misaligned components are also part of another assembly, such misalignments can also affect the function and/or aesthetic appearance of the entire assembly. Regardless of whether such misalignment is limited to two components or an entire assembly, it can negatively affect function and result in a perception of poor quality.

To align and secure components, the aforementioned male and female alignment features may be employed in combination with separate retention components, such as snap-fit features for example, that serve to secure the components to each other. In such an assembly, the mating components are located relative to each other by the alignment features, and are fixed relative to each other by the separate retention components. Use of separate alignment features and retention components, one for alignment and the other for securement, may limit the effectiveness of each on a given assembly, as the alignment features cannot be employed where the retention components are employed.

Accordingly, the art of alignment systems can be enhanced by providing an alignment system or mechanism that can ensure precise two-way or four-way alignment, or alignment and retention, of two or more components via elastic averaging of a single elastically deformable alignment element disposed in mating engagement with a corresponding alignment feature.

SUMMARY OF THE INVENTION

In an exemplary embodiment of the invention, an elastically averaged alignment system is provided having a first component and a second component. The first component includes a first alignment member and an elastically deformable alignment element fixedly disposed with respect to the first alignment member. The second component includes a second alignment member and an alignment aperture fixedly disposed with respect to the second alignment member. The elastically deformable alignment element is configured and disposed to interferingly, deformably and matingly engage the alignment aperture. The elastically deformable alignment element includes a lobular hollow tube having four lobes, with a slotted retention feature on each of two opposing lobes that extend from an outer surface of the hollow tube radially inward toward a central axis of the hollow tube. Portions of the elastically deformable alignment element when inserted into the alignment aperture elastically deform to an elastically averaged final configuration that aligns the first alignment member with the second alignment member in at least two planar orthogonal directions. Each of the slotted retention features engages with an edge of the alignment aperture.

The above features and advantages and other features and advantages of the invention are readily apparent from the following detailed description of the invention when taken in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features, advantages and details appear, by way of example only, in the following detailed description of embodiments, the detailed description referring to the drawings in which:

FIG. 1 depicts a disassembled assembly view of an elastically averaged alignment and retention system having a first, a second, and optionally a third component, an elastically deformable alignment element in the form of a quad-lobular hollow tube, circular alignment apertures, and two pairs of slotted retention features disposed in different parallel planes on the quad-lobular hollow tube, in accordance with an embodiment of the invention;

FIG. 2 depicts a rear plan view of the first and second components of FIG. 1, but with all four slotted retention features disposed in a same plane, in a first pre-engagement state of assembly with respect to each, in accordance with an embodiment of the invention;

FIG. 3 depicts a rear plan view of the first and second components of FIG. 2 in a second partial-engagement state of assembly with respect to each, in accordance with an embodiment of the invention;

FIG. 4. depicts a rear plan view of the first and second components of FIG. 3 in a third full-engagement state of assembly with respect to each, in accordance with an embodiment of the invention;

FIG. 5 depicts a rear plan view of the first and second components of FIG. 1, but with an elongated slotted aperture in place of a circular aperture, and only one pair of slotted retention features, in a first pre-engagement state of assembly with respect to each, in accordance with an embodiment of the invention;

FIG. 6 depicts a rear plan view of the first and second components of FIG. 5 in a second partial-engagement state of assembly with respect to each other, in accordance with an embodiment of the invention;

FIG. 7 depicts a rear plan view of the first and second components of FIG. 6 in a third full-engagement state of assembly with respect to each other, in accordance with an embodiment of the invention;

FIG. 8 depicts a rear plan view of the first, second and third components of FIG. 1 in a full-engagement state of assembly with respect to each other, in accordance with an embodiment of the invention;

FIG. 9 depicts a cross section view of the elastically averaged alignment and retention system of FIG. 8 taken through section cut line 9-9, with hidden lines removed for clarity;

FIG. 9A depicts an enlarged view of detail 9.1 in FIG. 9, with some background detail omitted for clarity;

FIG. 10 depicts a cross section view of the elastically averaged alignment and retention system of FIG. 8 take through section cut line 10-10, with hidden lines removed for clarity;

FIG. 10A depicts an enlarged view of detail 10.1 in FIG. 10, with some background detail omitted for clarity;

FIG. 11 depicts an exploded assembly view of an elastically averaged alignment and retention system similar to that of FIG. 1, but having only a first and a second component, and having a plurality of elastically averaging alignment elements and alignment apertures depicted generically, in accordance with an embodiment of the invention; and

FIG. 12 depicts a vehicle employing an elastically averaged alignment and retention system as depicted in any of FIGS. 1-11, in accordance with an embodiment of the invention.

 DESCRIPTION OF THE EMBODIMENTS

The following description is merely exemplary in nature and is not intended to limit the present disclosure, its application or uses. For example, the embodiments shown comprise vehicle components but the alignment system may be used with any suitable components to provide elastic averaging for precision location and alignment of all manner of mating components and component applications, including many industrial, consumer product (e.g., consumer electronics, various appliances and the like), transportation, energy and aerospace applications, and particularly including many other types of vehicular components and applications, such as various interior, exterior and under hood vehicular components and applications. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

As used herein, the term “elastically deformable” refers to components, or portions of components, including component features, comprising materials having a generally elastic deformation characteristic, wherein the material is configured to undergo a resiliently reversible change in its shape, size, or both, in response to application of a force. The force causing the resiliently reversible or elastic deformation of the material may include a tensile, compressive, shear, bending or torsional force, or various combinations of these forces. The elastically deformable materials may exhibit linear elastic deformation, for example that described according to Hooke's law, or non-linear elastic deformation.

Elastic averaging provides elastic deformation of the interface(s) between mated components, wherein the average deformation provides a precise alignment, the manufacturing positional variance being minimized to Xmin, defined by Xmin=X/√N, wherein X is the manufacturing positional variance of the locating features of the mated components and N is the number of features inserted. To obtain elastic averaging, an elastically deformable component is configured to have at least one feature and its contact surface(s) that is over-constrained and provides an interference fit with a mating feature of another component and its contact surface(s). The over-constrained condition and interference fit resiliently reversibly (elastically) deforms at least one of the at least one feature or the mating feature, or both features. The resiliently reversible nature of these features of the components allows repeatable insertion and withdrawal of the components that facilitates their assembly and disassembly. In some embodiments, the elastically deformable component configured to have the at least one feature and associated mating feature disclosed herein may require more than one of such features, depending on the requirements of a particular embodiment. Positional variance of the components may result in varying forces being applied over regions of the contact surfaces that are over-constrained and engaged during insertion of the component in an interference condition. It is to be appreciated that a single inserted component may be elastically averaged with respect to a length of the perimeter of the component. The principles of elastic averaging are described in detail in commonly owned, co-pending U.S. patent application Ser. No. 13/187,675, now U.S. Publication No. U.S. 2013-0019455, the disclosure of which is incorporated by reference herein in its entirety. The embodiments disclosed above provide the ability to convert an existing component that is not compatible with the above-described elastic averaging principles, or that would be further aided with the inclusion of a two-way or four-way elastic averaging alignment, or alignment and retention, system as herein disclosed, to an assembly that does facilitate elastic averaging and the benefits associated therewith.

Any suitable elastically deformable material may be used for the mating components and alignment features disclosed herein and discussed further below, particularly those materials that are elastically deformable when formed into the features described herein. This includes various metals, polymers, ceramics, inorganic materials or glasses, or composites of any of the aforementioned materials, or any other combinations thereof suitable for a purpose disclosed herein. Many composite materials are envisioned, including various filled polymers, including glass, ceramic, metal and inorganic material filled polymers, particularly glass, metal, ceramic, inorganic or carbon fiber filled polymers. Any suitable filler morphology may be employed, including all shapes and sizes of particulates or fibers. More particularly any suitable type of fiber may be used, including continuous and discontinuous fibers, woven and unwoven cloths, felts or tows, or a combination thereof. Any suitable metal may be used, including various grades and alloys of steel, cast iron, aluminum, magnesium or titanium, or composites thereof, or any other combinations thereof. Polymers may include both thermoplastic polymers or thermoset polymers, or composites thereof, or any other combinations thereof, including a wide variety of co-polymers and polymer blends. In one embodiment, a preferred plastic material is one having elastic properties so as to deform elastically without fracture, as for example, a material comprising an acrylonitrile butadiene styrene (ABS) polymer, and more particularly a polycarbonate ABS polymer blend (PC/ABS). The material may be in any form and formed or manufactured by any suitable process, including stamped or formed metal, composite or other sheets, forgings, extruded parts, pressed parts, castings, or molded parts and the like, to include the deformable features described herein. The elastically deformable alignment features and associated component may be formed in any suitable manner. For example, the elastically deformable alignment features and the associated component may be integrally formed, or they may be formed entirely separately and subsequently attached together. When integrally formed, they may be formed as a single part from a plastic injection molding machine, for example. When formed separately, they may be formed from different materials to provide a predetermined elastic response characteristic, for example. The material, or materials, may be selected to provide a predetermined elastic response characteristic of any or all of the elastically deformable alignment features, the associated component, or the mating component. The predetermined elastic response characteristic may include, for example, a predetermined elastic modulus.

As used herein, the term vehicle is not limited to just an automobile, truck, van or sport utility vehicle, but includes any self-propelled or towed conveyance suitable for transporting a burden.

In accordance with an exemplary embodiment of the invention, and with reference to FIG. 1, an elastically averaging alignment system 10 includes a first component 100 having a first alignment member 102 and an elastically deformable alignment element 104 fixedly disposed with respect to the first alignment member 102, and a second component 200 having a second alignment member 202 and an alignment aperture 204 fixedly disposed with respect to the second alignment member 202. In an embodiment, the alignment aperture 204 is a circular aperture (herein referred to by reference numeral 204), as illustrated in FIGS. 1-4, for providing elastically averaged four-way alignment and retention. In another embodiment, the alignment aperture 204 is an elongated slotted aperture (herein referred to by reference numeral 204a), which will be discussed in more detail with reference to FIGS. 5-7, for providing elastically averaged two-way alignment and retention. The major axis of the elongated slotted aperture may be oriented along the x-axis or the y-axis, depending on which direction the elastically averaged two-way alignment and retention of the components needs to be controlled. The elastically deformable alignment element 104 is configured and disposed to interferingly, deformably and matingly engage the alignment feature 204, in a manner discussed in more detail below, to precisely align the first component 100 with the second component 200 in either two directions or four directions, such as the +/−x-direction and/or the +/−y-direction of an orthogonal coordinate system, for example, which are herein referred to as two-way alignment and four-way alignment, respectively.

For discussion purposes, the mating side of the first alignment member 102 visible in FIG. 1 is labeled 12, and the mating side of the second alignment member 202 visible in FIG. 1 is labeled 22. The non-visible sides of the first and second alignment members 102, 202 that are hidden from view in FIG. 1 are herein referred to by reference labels 11 and 21, respectively. For discussion purposes, the 12 and 22 sides are herein referred to as front views, and the 11 and 21 sides are herein referred to as rear views. Dashed lines 20 represent direction lines that may be traversed as the first and second components 100, 200 are assembled with respect to each other.

In an embodiment, the elastically deformable alignment element 104 is a lobular hollow tube (also herein referred to by reference numeral 104) having four outwardly oriented lobes 106.1, 106.2, 106.3, 106.4 relative to a central axis 108 of the lobular hollow tube 104 (best seen with reference to FIG. 2), and the alignment feature is a circular aperture 204. In an embodiment, a chamfer 206 circumscribes the circular aperture 204 to facilitate insertion of the elastically deformable alignment element 104 into the circular aperture 204. In an embodiment, the lobular hollow tube 104 may also be herein referred to as a quad-lobular hollow tube, or a diamond-shaped lobular hollow tube. In an embodiment, an outer profile of a cross section of the lobular hollow tube 104 has sides that form a rhombus or a square shape.

In an embodiment, the lobular hollow tube 104 has a proximal end 114 proximate the first alignment member 102, and a distal end 116 spaced apart from the proximal end 114. In an embodiment, the distal end 116 has a taper 118 (best seen with reference to FIGS. 9 and 10) to facilitate insertion of the elastically deformable alignment element 104 into the alignment aperture 204.

In an embodiment, the lobular hollow tube 104 includes slotted retention features 110.1, 110.2, 112.1, 112.2 that extend from an outer surface of the lobular hollow tube 104 radially inward toward the central axis 108 of the lobular hollow tube 104, and may extend only partially through the wall thickness of the lobular hollow tube 104, or completely through the wall thickness. While the several figures described herein depicted slotted retention features that extend completely through the lobular hollow tube, it will be appreciated that the scope of the invention is not so limited and also encompasses partial slots or notches that do not extend completely through the lobular hollow tube, but still function in a manner consistent with the disclosure provided herein. In an embodiment, slotted retention features 110.1 and 110.2 are disposed on two opposing lobes (corners) of the lobular hollow tube 104, and slotted retention features 112.1 and 112.2 are disposed on the other two opposing lobes (corners) of the lobular hollow tube 104. While FIG. 1 depicts slotted retention features 110.1, 110.2, 112.1, 112.2 for providing retention as well as alignment, it will be appreciated that the scope of the invention is not so limited and also encompasses a quad-lobular hollow tube 104 absent the slotted retention features 110.1, 110.2, 112.1, 112.2 for providing alignment without retention.

In a first embodiment, the opposing slotted retention features 112.1, 112.2 are absent, and the opposing slotted retention features 110.1, 110.2 are disposed in a same plane oriented perpendicular to the central axis 108 of the lobular hollow tube 104a, to provide an elastically averaged two-way alignment and retention system for example (see FIGS. 5-7 for example).

In a second embodiment, the slotted retention features 110.1, 110.2, 112.1, 112.2 are all disposed in a same plane oriented perpendicular to the central axis 108 of the lobular hollow tube 104, to provide an elastically averaged four-way alignment and retention system for example (see FIGS. 2-4 for example).

In a third embodiment, a first pair of the slotted retention features 110.1, 110.2 are disposed in a first plane oriented perpendicular to the central axis of the lobular hollow tube 104, and the second pair of slotted retention features 112.1, 112.2 are disposed in a second plane oriented perpendicular to the central axis 108 of the lobular hollow tube 104, where the first and second planes are different from and spaced apart from each other, to provide an elastically averaged alignment and retention system for three components for example (see FIGS. 1 and 8-10 for example).

Accordingly and as discussed above, an embodiment may include just one pair of opposing slotted retention features 110.1, 110.2 (or 112.1, 112.1) to provide elastically averaged two-way alignment and retention when engaged with an elongated slotted aperture 204a (best seen with reference to FIGS. 5-7), another embodiment may include all four slotted retention features 110.1. 110.2, 112.1, 112.2 disposed in a same plane to provide elastically averaged four-way alignment and retention when engaged with a circular aperture 204 (best seen with reference to FIGS. 2-4), and another embodiment may include pairs of the slotted retention features 110.1, 110.2 and 112.1, 112.2 disposed in different planes to provide elastically averaged two-way alignment and retention of three components, which will be discussed in more detail below with reference to FIGS. 1 and 8-10.

Portions of the elastically deformable alignment element (lobular hollow tube) 104, when inserted into the alignment aperture 204, elastically deform to an elastically averaged final configuration that aligns the first alignment member 102 with the second alignment member 202 in two or four planar orthogonal directions, depending on whether one or two pairs of the slotted retention features 110.1, 110.2, 112.1, 112.2 are employed, and whether the alignment aperture is a circular alignment aperture 204 or an elongated slotted alignment aperture 204a. In an embodiment, when the lobular hollow tube 104 is properly inserted into the circular alignment aperture 204, each of the slotted retention features 110.1, 110.2, 112.1, 112.2 engage with an edge of the circular alignment aperture 204 (best seen with reference to FIGS. 2-4). Other engagement configurations are discussed herein with reference to FIGS. 5-7 and 8-10.

Reference is now made to FIGS. 2-4, which depict, as viewed from side 21 of the second alignment member 202, three stages of assembly of a quad-lobular hollow tube 104 having the four slotted retention features 110.1, 110.2, 112.1, 112.2 as described above in connection with the second embodiment, where the slotted retention features 110.1, 110.2, 112.1, 112.2 are disposed in a same plane oriented perpendicular to the central axis 108 of the lobular hollow tube 104, to provide four-way elastically averaged alignment and retention with respect to the circular alignment aperture 204.

The first stage of assembly (FIG. 2) depicts the quad-lobular hollow tube 104 just prior to engagement with the circular alignment aperture 204. As depicted, each lobe 106.1, 106.2, 106.3, 106.4 has a purposeful interference condition with the diameter 250 of the circular alignment aperture 204 by an interference dimension of 255. In an embodiment, the interference dimension 255 may be the same for each lobe 106.1, 106.2, 106.3, 106.4, or may be different, thereby alternatively providing four different interference dimensions 255.1, 255.2, 255.3, 255.4, respectively. FIG. 2 depicts the chamfer 206 in dashed hidden lines having a diameter equal to or greater than a maximum outside dimension of the lobular hollow tube 104 illustrating that the chamfer 206 provides a lead in feature for the lobes during their initial insertion and compression.

The second stage of assembly (FIG. 3) depicts a partial engagement position of the quad-lobular hollow tube 104 with the circular alignment aperture 204. As depicted, the quad-lobular hollow tube 104 purposefully and elastically deforms to compensate for the interference 255 (see FIG. 2) to permit the quad-lobular hollow tube 104 to assemble into the circular alignment aperture 204 with a clearance 260 between the outer periphery of the quad-lobular hollow tube 104 and the diameter 250 of the circular alignment aperture 204. In an embodiment, clearance 260 ≧0 inches.

The third stage of assembly (FIG. 4) depicts a full engagement position of the quad-lobular hollow tube 104 with the circular alignment aperture 204. As depicted, the quad-lobular hollow tube 104 elastically expands toward its original shape, with some slight deformation remaining, as the slotted retention features 110.1, 110.2, 112.1, 112.2 engage with the edge of the circular alignment aperture 204. In an embodiment, the width 150 of each slotted retention feature 110.1, 110.2, 112.1, 112.2 is greater than the thickness 265 of the second alignment member 202 (best seen with reference to FIG. 1), thereby permitting a snap-fit type engagement between the slotted retention features 110.1, 110.2, 112.1, 112.2 and the edge of the circular alignment aperture 204.

Reference is now made to FIGS. 5-7, which depict, as viewed from side 21 of the second alignment member 202, three stages of assembly of a quad-lobular hollow tube 104a having the two opposing slotted retention features 110.1, 110.2 as described above in connection with the first embodiment, where the slotted retention features 110.1, 110.2 are disposed in a same plane oriented perpendicular to the central axis 108 of the lobular hollow tube 104a, to provide two-way elastically averaged alignment and retention with respect to an elongated slotted alignment aperture 204a, which may include a chamfer 206a (see FIG. 5) similar to the chamfer 206 described above in connection with the circular alignment aperture 204.

The first stage of assembly (FIG. 5) depicts the quad-lobular hollow tube 104a just prior to engagement with the circular aperture 204a. As depicted, each lobe 106.2, 106.4 has a purposeful interference condition with the minor dimension 270 of the elongated slotted alignment aperture 204a by an interference dimension of 255. In an embodiment, the interference dimension 255 may be the same for each lobe 106.2, 106.4, or may be different, thereby alternatively providing two different interference dimensions 255.5, 255.6, respectively. FIG. 5 depicts the chamfer 206a in dashed hidden lines having an outside dimension equal to or greater than a maximum outside dimension of the lobular hollow tube 104a illustrating that the chamfer 206a provides a lead in feature for the lobes during their initial insertion and compression.

The second stage of assembly (FIG. 6) depicts a partial engagement position of the quad-lobular hollow tube 104a with the elongated slotted alignment aperture 204a. As depicted, the quad-lobular hollow tube 104a purposefully and elastically deforms to compensate for the interference 255 (see FIG. 5) to permit the quad-lobular hollow tube 104a to assemble into the elongated slotted alignment aperture 204a with a clearance 275 between the outer periphery of the quad-lobular hollow tube 104a and the major dimension 280 of the elongated slotted alignment aperture 204a. In an embodiment, clearance 275 ≧0 inches.

The third stage of assembly (FIG. 7) depicts a full engagement position of the quad-lobular hollow tube 104a with the elongated slotted alignment aperture 204a. As depicted, the quad-lobular hollow tube 104a elastically expands toward its original shape, with some slight deformation remaining, as the slotted retention features 110.1, 110.2 engage with the edge of the elongated slotted alignment aperture 204a. In an embodiment, the width 150 of each slotted retention feature 110.1, 110.2 is greater than the thickness 265 of the second alignment member 202 (best seen with reference to FIG. 1), thereby permitting a snap-fit type engagement between the slotted retention features 110.1, 110.2 and the edge of the elongated slotted alignment aperture 204a.

Reference is now made to FIGS. 8-10, in combination with FIG. 1. FIG. 8 depicts a rear view of the elastically averaged alignment system 10 of FIG. 1 with the first, second and third components 100, 200, 300 assembled together, and FIGS. 9 and 10 depict cross section views of the aforementioned third embodiment, where the first pair of the slotted retention features 110.1, 110.2 are disposed in a first plane oriented perpendicular to the central axis 108 (see FIG. 8) of the lobular hollow tube 104, and the second pair of slotted retention features 112.1, 112.2 are disposed in a second plane oriented perpendicular to the central axis 108 of the lobular hollow tube 104, where the first and second planes are different from and spaced apart from each other, to provide an elastically averaged alignment and retention system for three components 100, 200 and 300, as depicted in FIG. 1. As depicted, the third component 300 has a third alignment member 302 and an alignment aperture 304, in the form of a circular alignment aperture, fixedly disposed with respect to the third alignment member 302, where the second component 200 is disposed between the first component 100 and the third component 300. While FIG. 1 depicts three components 100, 200, 300, it will be appreciated that the scope of the invention is not so limited, and also encompasses any number of layers beyond three that is consistent with the disclosure provided herein.

Similar to the aforementioned description of sides 11, 12, 21, 22, the mating side of the third alignment member 302 visible in FIG. 1 is labeled 32, and the non-visible side of the third alignment member 302 that is hidden from view in FIG. 1 is herein referred to by reference label 31. As before, a view from side 32 is herein referred to as a front view, and a view from side 31 is herein referred to as a rear view. Furthermore, dashed lines 20a represent direction lines that may be traversed as the first, second and third components 100, 200, 300 are assembled with respect to each other. FIG. 8 is a rear plan view from side 31 of the third component 300, but for simplicity does not illustrate all of the deformation characteristics of the quad-lobular hollow tube 104 with pairs of slotted retention features 110.1, 110.2 and 112.1, 112.2 disposed in different planes. Such deformation characteristics will now be discussed with reference to the cross section views in FIGS. 9 and 10, with section cut lines 9-9 and 10-10 depicted in FIG. 8.

In accordance with the aforementioned third embodiment, the elastically deformable alignment element (quad-lobular hollow tube) 104 is not only configured and disposed to interferingly, deformably and matingly engage the circular alignment aperture 204 of the second component 200, in a manner similar to the description provided above, but is also configured and disposed to interferingly, deformably and matingly engage the circular alignment aperture 304 of the third component 300. As depicted in FIGS. 1, 9 and 10, the first pair of the slotted retention features 110.1, 110.2 are disposed to engage with edges of the circular alignment aperture 304 of the third component 300, and the second pair of the slotted retention features 112.1, 112.2 are disposed to engage with edges of the circular alignment aperture 204 of the second component 200. Since the pairs of slotted retention features 110.1, 110.2 and 112.1, 112.2 are disposed in different planes, the other two lobes of the quad-lobular hollow tube 104 in those respective planes are not slotted, and therefore that portion of the quad-lobular hollow tube 104 must elastically deform when inserted into the respective circular aperture. For example, at the circular alignment aperture 204 of the second component 200, lobes 106.1, 106.3 have slotted retention features 112.1, 112.2, respectively, that engage with the edge of the circular alignment aperture 204 (see FIG. 9 for example), and lobes 106.2, 106.4 have no slotted retention features causing the quad-lobular hollow tube 104 to elastically deform in the circular alignment aperture 204 (see FIG. 10 for example). As further example, at the alignment aperture 304 of the third component 300, lobes 106.2, 106.4 have slotted retention features 110.1, 110.2, respectively, that engage with the edge of the circular alignment aperture 304 (see FIG. 10 for example), and lobes 106.1, 106.3 have no slotted retention features causing the quad-lobular hollow tube 104 to elastically deform in the circular alignment aperture 304 (see FIG. 9 for example).

In an embodiment, and with reference still to FIGS. 9 and 10 in combination with FIG. 1 and FIGS. 9A and 10A, the inside diameters of the second and third alignment apertures 204, 304 are equally sized and concentric such that they are aligned with each other from a plan view perspective, as indicated by dashed lines 51, 52, 53 and 54 in FIGS. 9A and 10A, which causes deformation of the lobular hollow tube 104 in an area absent slotted retention features, and positive snap fit engagement of the lobular hollow tube 104 with a respective second and third component 200, 300 in those areas having slotted retention features.

FIGS. 9 and 10 also depict chamfers 104.1 on the upper edge of slotted retention features 110.1, 110.2, and chamfers 104.2 on the upper edge of slotted retention features 112.1, 112.2, that serve to facilitate removal of the second and third components 200, 300 from the first component 100. Such removal may also be facilitated by including chamfers similar to chamfers 206, 306, but on the opposite surfaces 21, 31 of the second and third components 200, 300.

While FIGS. 1 and 8-10, along with the above description of the third embodiment, depict circular alignment apertures 204, 304 in engagement with the quad-lobular hollow tube 104, it will be appreciated that elongated slotted alignment apertures, such as 204a for example, may replace the circular alignment apertures 204, 304 in a strategic orientation relative to the x-y axes that would avoid deformation of the quad-lobular hollow tube 104 in those areas absent slotted retention features. Any and all such combinations of circular and elongated slotted alignment apertures are contemplated herein and considered to be within the scope of the invention disclosed herein.

From all of the foregoing, and with reference now to FIG. 11, it will be appreciated that an embodiment of an elastically averaged alignment system 10a may include any of the combinations of the elastically deformable alignment elements and respective alignment apertures as described herein, or as described in commonly owned, co-pending U.S. patent application Ser. No. 13/187,675. In a general sense, FIG. 11 depicts a first component 100a having a first alignment member 102a, and a second component 200a having a second alignment member 202a with a thickness 265, similar to the un-primed counterparts depicted in FIG. 1. In FIG. 11, the X-based-arrowhead-graphics 704.1, 704.2, 704.3, 704.4 represent elastically deformable alignment elements, such as the elastically deformable alignment element 104 described herein or the elastically deformable alignment element described in commonly owned, co-pending U.S. patent application Ser. No. 13/187,675, and the 3D-X-graphics 804.1, 804.2, 804.3, 804.4 represent alignment apertures, such as alignment apertures 204, 204a, 304 as described herein, pierced through the thickness 265. As depicted in FIG. 11, the elastically deformable alignment elements and alignment apertures are configured and disposed to interferingly, deformably and matingly engage with each other in the following pairs: 704.1 and 804.1; 704.2 and 804.2; 704.3 and 804.3; and, 704.4 and 804.4. While only four pairs of elastically deformable alignment elements and alignment apertures are depicted in FIG. 11, it will be appreciated that the scope of the invention is not so limited and encompasses any number of pairs of elastically deformable alignment elements and alignment apertures suitable for a purpose disclosed herein. By strategically placing two-way and four-way alignment features on the various components as disclosed herein, a wide range of alignment control is possible, including edge alignment control, corner alignment control, and center alignment control, for example.

In view of all of the foregoing, and with reference now to FIG. 12, it will be appreciated that an embodiment of the invention also includes a vehicle 40 having a body 42 with an elastically averaged alignment system 10, 10a as herein disclosed integrally arranged with the body 42. In the embodiment of FIG. 12, the elastically averaged alignment system 10, 10a is depicted forming at least a portion of a front grill of the vehicle 40. However, it is contemplated that an elastically averaged alignment system 10, 10a as herein disclosed may be utilized with other feature of the vehicle 40, such as interior trim for example, where the first component 100 forms a first portion of the vehicle 40, the second component 200 forms a second portion of the vehicle 40, and the third component 300 forms a third portion of the vehicle 40.

While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the application.

Claims

1. An elastically averaged alignment system, comprising:

a first component comprising a first alignment member and an elastically deformable alignment element fixedly disposed with respect to the first alignment member;
a second component comprising a second alignment member and an alignment aperture fixedly disposed with respect to the second alignment member;
wherein the elastically deformable alignment element is configured and disposed to interferingly, deformably and matingly engage the alignment aperture;
wherein the elastically deformable alignment element comprises a lobular hollow tube having four lobes, the elastically deformable alignment element comprising a slotted retention feature on each of two opposing lobes that extend from an outer surface of the hollow tube radially inward toward a central axis of the hollow tube;
wherein portions of the elastically deformable alignment element when inserted into the alignment aperture elastically deform to an elastically averaged final configuration that aligns the first alignment member with the second alignment member in at least two planar orthogonal directions; and
wherein each of the slotted retention features engages with an edge of the alignment aperture.

2. The elastically averaged alignment system of claim 1, wherein:

portions of the elastically deformable alignment element when inserted into the alignment aperture elastically deform to an elastically averaged final configuration that aligns the first alignment member with the second alignment member in four planar orthogonal directions.

3. The elastically averaged alignment system of claim 1, wherein:

the alignment aperture comprises a circular aperture.

4. The elastically averaged alignment system of claim 1, wherein:

the alignment aperture comprises an elongated slotted aperture.

5. The elastically averaged alignment system of claim 1, wherein:

the slotted retention features are disposed in a same plane oriented perpendicular to the central axis of the hollow tube.

6. The elastically averaged alignment system of claim 1, wherein:

the elastically deformable alignment element comprises a slotted retention feature on each of the four lobes, each slotted retention feature extending from an outer surface of the hollow tube radially inward toward the central axis of the hollow tube.

7. The elastically averaged alignment system of claim 6, wherein:

a first pair of the slotted retention features oppose each other in a first plane oriented perpendicular to the central axis of the hollow tube; and
a second pair of the slotted retention features oppose each other in the first plane.

8. The elastically averaged alignment system of claim 6, wherein:

a first pair of the slotted retention features oppose each other in a first plane oriented perpendicular to the central axis of the hollow tube; and
a second pair of the slotted retention features oppose each other in a second plane oriented perpendicular to the central axis of the hollow tube, the second plane being different from the first plane.

9. The elastically averaged alignment system of claim 1, wherein:

the slotted retention features extend only partially from an outer surface to an inner surface of the hollow tube.

10. The elastically averaged alignment system of claim 1, wherein:

the slotted retention features are through-slots that extend completely from an outer surface to an inner surface of the hollow tube.

11. The elastically averaged alignment system of claim 1, wherein:

the elastically deformable alignment element comprises a proximal end proximate the first alignment member, and a distal end spaced apart from the proximal end, the distal end comprising a taper.

12. The elastically averaged alignment system of claim 1, wherein:

the second alignment member comprises a chamfer that circumscribes the alignment aperture.

13. The elastically averaged alignment system of claim 1, wherein:

the first component further comprises a second elastically deformable alignment element fixedly disposed with respect to the first alignment member;
the second component further comprises a second alignment aperture fixedly disposed with respect to the second alignment member;
the second elastically deformable alignment element is configured and disposed to interferingly, deformably and matingly engage the second alignment aperture; and
portions of the second elastically deformable alignment element when inserted into the second alignment aperture elastically deform to an elastically averaged final configuration that further aligns the first alignment member with the second alignment member in at least two planar orthogonal directions.

14. The elastically averaged alignment system of claim 8, further comprising:

a third component comprising a third alignment member and an alignment aperture fixedly disposed with respect to the third alignment member, the second component being disposed between the first and third components;
wherein the elastically deformable alignment element is configured and disposed to interferingly, deformably and matingly engage the alignment aperture of the third component; and
wherein the first pair of the slotted retention features are disposed to engage with edges of the alignment aperture of the third component, and the second pair of the slotted retention features are disposed to engage with edges of the alignment aperture of the second component.

15. The elastically averaged alignment system of claim 1, wherein:

the first component comprises a first portion of a vehicle; and
the second component comprises a second portion of the vehicle.

16. The elastically averaged alignment system of claim 1, wherein the first component comprises more than one of the elastically deformable alignment element and the second component comprises more than one of the alignment aperture, the more than one elastically deformable alignment elements being geometrically distributed with respect to respective ones of the more than one alignment apertures, such that portions of the elastically deformable alignment element of respective ones of the more than one elastically deformable alignment elements, when engaged with respective ones of the more than one alignment apertures, elastically deform to an elastically averaged final configuration that further aligns the first alignment member with the second alignment member in at least two of four planar orthogonal directions.

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Patent History
Patent number: 9457845
Type: Grant
Filed: Oct 2, 2013
Date of Patent: Oct 4, 2016
Patent Publication Number: 20150093178
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC (Detroit, MI)
Inventors: Steven E. Morris (Fair Haven, MI), Jennifer P. Lawall (Waterford, MI)
Primary Examiner: James Ference
Application Number: 14/044,199
Classifications
Current U.S. Class: Related To Joint Component (403/14)
International Classification: B62D 27/02 (20060101); B62D 27/06 (20060101); B60R 13/00 (20060101); F16B 19/00 (20060101); F16B 21/08 (20060101); B60R 13/02 (20060101); B60R 19/52 (20060101); F16B 5/06 (20060101);